Materials Literature
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Diffusion of asymmetric diblock and triblock copolymers in a three-dimensional periodic potential field with body centered cubic (bcc) symmetry is simulated numerically using Langevin dynamics. To simulate unentangled copolymer melts, a spring and bead model ( Rouse ) is introduced. To simulate entangled polymer melts…
Measurements of the phase delay of the current and force on a ring floated on a commonly available Thomson’s jumping ring apparatus were performed for phase angles from 12° to 88°. The force and phase data show excellent agreement with a linear inductive model. We find that the demonstration, as usually performed with…
A surface-enhanced Raman scattering (SERS) study has been performed for benzyl phenyl sulfide (BPS) and dibenzyl sulfide (DBS) in aqueous gold sol to examine the feasibility of the occurrence of surface-induced photoreactions of aromatic sulfides. Although BPS and DBS were reported to be decomposed into mercaptides on…
An improvement of methods for estimating the rotational temperature from the partially resolved 391.44 nm emission band of N 2 + (B 2 u + - X 2 g + ) has been developed by numerically studying this band as a function both of the temperature and of the instrumental function of the detection system. We give a simple tab…
The antiferromagnetic manganite ${\mathrm{Pr}}_{0.5}{\mathrm{Sr}}_{0.5}\ensuremath{-}{\mathrm{MnO}}_{3}$ was investigated at low temperature by means of magnetometry and ${}^{55}\mathrm{Mn}$ NMR. A field-induced transition to a ferromagnetic state is detected by magnetization measurements at a threshold field of a few…
Strongly zoned Mn-rich vesuvianites with MnO concentrations up to 14.3 wt% from the N’chwaning II mine of the Kalahari manganese field (South Africa) crystallized at hydrothermal conditions below 450 °C. These vesuvianites are by far the most Mn-rich samples hitherto described and have either space group P4nc or P4/n…
A dual-phase-lag diffusion (DPLD) model, which extends Fick's law by including two lagging times, j for the mass flux vector and for the density gradient, is developed to predict thin film growth. Depending upon the phase lag ratio / j , the DPLD model uniquely characterizes four types of growth kinetics as reported i…
SrBPO5 was synthesized by a solid-state reaction reported and by a new solid state reaction using BPO4 as a phosphating agent. It was also obtained by a hydrothermal method. The structure of the compound was solved by Rietveld analysis before. The examination of X-ray powder diffraction data showed that, SrBPO5 is iso…
In order to improve the safe handling and control of tritium for the ITER fuel cycle, effective in situ tritium accounting methods have been developed at the Tritium Process Laboratory in the Japan Atomic Energy Research Institute under one of the ITER-EDA R&D tasks. The remote and multilocation analysis of process ga…
Static and dynamic properties of supercooled liquid and glassy ethanol are evaluated from computer molecular dynamics simulations and compared with experimental data whenever possible. In particular, a comparison with recent neutron-scattering data is done and the results indicate that the relatively simple model here…
When boundary conditions arising from the usual hydrodynamic assumptions are applied, analyses of dynamic wetting processes lead to a well-known nonintegrable stress singularity at the dynamic contact line, necessitating new ways to model this problem. In this paper, numerical simulations for a set of representative p…
The freezing transition of a strongly dipolar Lennard-Jones fluid is investigated using Monte Carlo simulation. It is found that the system undergoes a ferroelectric liquid-to-solid transition when cooled under a constant pressure. Near the triple point the stable solid phase is a body-centered orthorhombic ferroelect…
A novel approach to the preparation of light-emitting diodes is presented here. Hybrid sol–gel layers have been employed as a film-forming rigid matrix doped with highly fluorescent perylene dyes (e.g., see Fig.) as light emitters. Electroluminescence was found to be remarkable even at incorporation levels as low as 6…
Control over the long-range orientation of liquid crystals (LCs) has been achieved by embedding LCs into porous thin films with engineered microstructures. Glancing angle deposition was used to fabricate these porous thin films (see Figure), and results are summarized here that show how the films act as alignment or “…
Abstract Silane coupling agents containing a carboxy group are not known because the chloro- or alkoxy group is reactive to the carboxylic acid. In this study, silane coupling agents bearing a 2-nitrobenzyl ester as a protecting group of carboxylic acid were synthesized and applied for surface modification of silica g…
A novel method has been found to enhance the metastable zone width of solutions in their supersaturated region in order to grow large size crystals. In which, the incorporation of a small quantity of Ethylenediamine tetra acetic acid (EDTA), a well-known chelating agent, enhances the zone width significantly due to it…
A critical examination of the reference X-ray powder-diffraction patterns of the serpentine minerals in the Powder-Diffraction File (PDF) database has revealed an unsettling situation. Most of the patterns in, or previously in, the PDF database are inaccurate, misidentified, or of poor quality. The PDF database is not…
peer reviewed
In situ Raman scattering measurements have been obtained for vitreous ${\mathrm{ZnCl}}_{2}$ compressed isothermally to 25 GPa. The Raman spectra indicate that, in contrast to other tetrahedral framework glasses, when compressed at room temperature glassy ${\mathrm{ZnCl}}_{2}$ crystallizes to the high-pressure ${\mathr…
Two previously unreported low-temperature structures of chlorine on silver(111) are discussed: the sharp Ag(111)−(√3 × √3)R30°−Cl, which disorders above 195 K and a split spot pattern assigned as Ag(111)−(13 × 13)−Cl. The latter surface is also disordered at room temperature and gives a diffuse pattern reminiscent of…